<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <style>
        body {
            padding: 100px;
        }

        article {
            /* border-style: groove;
            border-top-width: 20px;
            border-right-width: 2px;
            border-top-color: red; */
            /* border-top: double 10px red; */
            /* border-bottom: solid 20px green; */
            /* border: solid 30px blue; */
            width: 300px;
            height: 300px;
        }

        div {
            /* padding: 30px 50px 100px 80px; */
        }

        div>em {
            border-left: solid 1px green;
            padding-left: 20px;
        }
    </style>
</head>

<body>
    <article>
        <div>houdunren.com <em>hdcms.com</em></div>
    </article>
</body>

</html>